Process for recovering catalytic product

Abstract

A process is disclosed for recovering product from catalytically converted product streams. An integrated debutanizer column provides an LPG stream, a light naphtha stream and a heavy naphtha stream. The integrated debutanizer column may comprise a dividing wall column. The light naphtha stream may be used as an absorbent for a primary absorber column which provides advantageous operation.

The invention claimed is: 
     
       1. A catalytic cracking process comprising:
 contacting a hydrocarbon feed with catalyst to provide products; 
 fractionating a portion of said products in a main fractionation column to provide fractionated products; 
 compressing a portion of said fractionated products to provide a compressed, fractionated product; 
 separating said compressed, fractionated products into a vapor stream and said liquid stream; 
 contacting said vapor stream with at least a portion of a light naphtha stream boiling between about 25 and about 65° C. in an absorber column; 
 stripping a liquid stream of said fractionated products; and 
 fractionating a stripped liquid stream in a debutanizer column to provide an LPG stream, said light naphtha stream boiling between about 25 and about 65° C. and a heavy naphtha stream. 
 
     
     
       2. The catalytic cracking process of  claim 1  wherein said debutanizer column is a dividing wall column. 
     
     
       3. The catalytic cracking process of  claim 1  further comprising splitting said heavy naphtha stream in a naphtha splitter column. 
     
     
       4. The catalytic cracking process of  claim 3  wherein said naphtha splitter column provides a middle naphtha stream, an aromatic naphtha stream and a concentrated heavy gasoline stream. 
     
     
       5. The catalytic cracking process of  claim 4  wherein said naphtha splitter column is a dividing wall column. 
     
     
       6. The cracking process of  claim 1  further comprising regenerating spent catalyst to provide said catalyst. 
     
     
       7. The cracking process of  claim 1  further comprising condensing an overhead product stream from said main fractionation column and feeding said condensed overhead product stream to said absorber column. 
     
     
       8. A separation process comprising:
 stripping a catalytically cracked product stream to provide a stripped liquid product stream; 
 fractionating said stripped liquid product stream in a debutanizer column to provide an LPG stream, a light naphtha stream boiling between about 25 and about 65° C. and a heavy naphtha stream; and 
 contacting said light naphtha stream with a vaporous hydrocarbon stream in an absorber column. 
 
     
     
       9. The separation process of  claim 8  wherein said debutanizer column is a dividing wall column. 
     
     
       10. The separation process of  claim 8  further comprising splitting said heavy naphtha stream in a naphtha splitter column. 
     
     
       11. The separation process of  claim 10  wherein said naphtha splitter column is a dividing wall column that provides a middle naphtha stream, an aromatic naphtha stream and a concentrated heavy gasoline stream. 
     
     
       12. The separation process of  claim 8  further comprising:
 compressing a portion of fractionated catalytically cracked products to provide compressed, fractionated products; 
 separating said compressed, fractionated products into a vapor stream and a liquid stream; and 
 contacting said vapor stream with at least a portion of said light naphtha stream in an absorber column. 
 
     
     
       13. A catalytic cracking process comprising:
 contacting a hydrocarbon feed with catalyst to provide products; 
 fractionating a portion of said products in a main fractionation column to provide fractionated products; 
 contacting a vapor stream of said fractionated products with a light naphtha stream boiling between about 25 and about 65° C. in an absorber column; 
 stripping a liquid stream of said fractionated products; and 
 fractionating a stripped liquid stream in a dividing wall debutanizer column to provide an LPG stream, said light naphtha stream boiling between about 25 and about 65° C. and a heavy naphtha stream. 
 
     
     
       14. The catalytic cracking process of  claim 13  further comprising splitting said heavy naphtha stream in a naphtha splitter column. 
     
     
       15. The catalytic cracking process of  claim 14  wherein said naphtha splitter column provides a middle naphtha stream, an aromatic naphtha stream and a concentrated heavy gasoline stream. 
     
     
       16. The catalytic cracking process of  claim 15  wherein said naphtha splitter column is a dividing wall column. 
     
     
       17. The catalytic cracking process of  claim 13  further comprising:
 compressing a portion of said fractionated products to provide compressed, fractionated products; 
 separating said compressed, fractionated products into said vapor stream and said liquid stream; and 
 contacting said vapor stream with at least a portion of said light naphtha stream in said absorber column. 
 
     
     
       18. The catalytic cracking process of  claim 13  further comprising regenerating spent catalyst to provide said catalyst. 
     
     
       19. The catalytic cracking process of  claim 13  further comprising condensing an overhead product stream from said main fractionation column and feeding said condensed overhead product stream to said absorber column.